A trailer has just been released for a forthcoming documentary on a Basque kayak expedition to the Kurssuaq River (meaning “Big River” in the local Greenlandic Inuit language) in Greenland. Aitor Goikoetxea and Mikel Sarasola from Gipuzkoa, together with Fermín Pérez and Edu Sola from Navarre, spent August and part of September this year in the little visited southwest corner of Greenland in search of challenging river descents.

This is, apparently, the first time such a descent has been attempted on this river by kayak. What’s more, following an unusually dry, mild, and warm spring and summer, water levels were particularly high with glacial run-off. Despite the potential hazards, the team opted for the biggest river of all, the Kurssuaq, and filmed the results for their forthcoming documentary. The actual descent involved a 12-day trek upriver before setting off.

Check out the amazing footage here:

The documentary will be released in 2017. Check out the team’s website here.